Moving the builder, planet and icedtea-backup servers

Unfortunately builder.classpath.org, planet.classpath.org and
icedtea.wildebeest.org (which acts as the icedtea backup server) need to
move to a different internet connection… twice…

First they will move today/tomorrow to a slower connection, and then one
or two weeks later they will hopefully move to a much faster connection.
Each time the IP addresses will change. This might cause some unexpected
downtime or make the servers unreachable for some time.

You might notice some warnings emitted when committing to one of the
repositories that trigger the buildbot when it cannot reach
builder.classpath.org. These are “harmless”, except that your commit
will not be tested by the autobuilders. So please be extra careful what
you commit in the next couple of days.